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为探求吐哈油田胜北构造粘土矿物水敏特性与井眼稳定性的关系,详细分析了Ensulin膨胀仪和CST分散仪使用中存在的问题,解释了泥页岩理化性能评价中各参数的物理意义,提出M5000和Y15—B评价泥页岩的潜在膨胀和分散能力,以台参2井为例测试了泥页岩吸水膨胀和吸水分散的特性,研究表明在3000m以上,由于伊蒙混层矿物含量较高,地层压实弱,吸水膨胀和分散能力较大,水敏性强.在3000~4000m井段,地层吸水快,但膨胀慢、分散慢,且膨胀和分散潜在能力较小,属中弱膨胀、中弱分散地层.在4000m以下,地层压实性好,膨胀弱分散慢,属弱膨胀的分散地层.总体上说,用泥页岩分类标准来评价,均属低膨胀低分散地层.井眼的不稳定主要不是由于粘土矿物的膨胀和分散而是过长时间的钻井液浸泡引起的地层周期性应力剥蚀所为.
In order to explore the relationship between water sensitivity and wellbore stability of the clay mineral in Shengbei Formation in Tuha Oilfield, the existing problems in the use of Ensulin dilatometer and CST disperser were analyzed in detail. The physical and chemical properties of shale petrophysical properties It is proposed that M5000 and Y15-B can be used to evaluate the potential swelling and dispersing ability of shale. Taking Taconite 2 as an example, the characteristics of swelling and water absorption and dispersion of shale are tested. The results show that above 3000 m, High content, weak compaction, water swelling and dispersion ability, water sensitivity. In 3000 ~ 4000m well section, the strata absorbs water rapidly, but it slowly expands and disperses slowly with less potential for expansion and dispersion. Below 4000m, the compaction of the formation is good, the expansion is weak and the dispersion is slow, which is a weakly expansive dispersed formation. In general, shale classification criteria are used to evaluate low-expansion and low-dispersion formations. The instability of the borehole is mainly caused by the periodic stress erosion caused by the drilling fluid immersion caused by the swelling and dispersion of clay minerals.